16-disk SW RAID-6 on RHEL?

[Trevor Hemsley]

Be aware that RHEL5.5 still has this bug.

http://www.issociate.de/board/post/455533/RAID6_mdadm_--grow_bug?.html

Peter Ruprecht wrote:
> Hi everyone,
>
> I could use a little advice. I'm considering setting up a 16-disk 
> software RAID-6 system for use as a samba fileserver. The disks would 
> be 2TB SATA in an external enclosure attached via SAS to the server 
> (RHEL5, 2x Xeon E5420 processors with 4 cores, 16 GB RAM).
>
> I have done software RAID-5 with 6 disks and gotten satisfactory 
> performance, but has anyone else tried SW RAID on a bigger scale? 
> Would that just be nuts?
>
> So why not just buy a HW RAID system? Well, in this case cost is a big 
> issue. Also, in the past I've had some issues with RAID controllers 
> freaking out leaving all the data inaccessible, which I think is less 
> likely with SW RAID.
>
> Finally, is there a reasonable RH-compatible alternative to xfs for a 
> 16TB+ filesystem? Or is xfs now less iffy than it was a few years ago?
>
> Thanks in advance,
> Peter Ruprecht
>
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-- 

Trevor Hemsley
Infrastructure Engineer
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